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## org.bouncycastle.crypto.generators
Class KDF2BytesGenerator

    java.lang.Object
      org.bouncycastle.crypto.generators.KDF2BytesGenerator

All Implemented Interfaces:
  DerivationFunction

public class KDF2BytesGenerator
extends java.lang.Object
implements DerivationFunction

Generator for PBE derived keys and ivs as defined by IEEE P1363a
This implementation is based on draft 9 of IEEE P1363a. Note: as this is still a draft the output of this generator may change, don't use it for anything that might be subject to long term storage.

Constructor Summary
`KDF2BytesGenerator(Digest digest)` Construct a KDF2 Parameters generator.

Method Summary
`int` | `generateBytes(byte[] out, int outOff, int len)` fill len bytes of the output buffer with bytes generated from the derivation function.
`Digest` | `getDigest()` return the underlying digest.
`void` | `init(DerivationParameters param)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### KDF2BytesGenerator

    public KDF2BytesGenerator(Digest digest)

  Construct a KDF2 Parameters generator. Generates key material according to IEEE P1363a - if you want orthodox results you should use a digest specified in the standard.

  Note: IEEE P1363a standard is still a draft standard, if the standard changes this function, the output of this function will change as well. Don't use this routine for anything subject to long term storage.

Parameters:
  `digest` - the digest to be used as the source of derived keys.

Method Detail

### init

    public void init(DerivationParameters param)

  Specified by:
    `init` in interface `DerivationFunction`

### getDigest

    public Digest getDigest()

  return the underlying digest.

  Specified by:
    `getDigest` in interface `DerivationFunction`

### generateBytes

    public int generateBytes(byte[] out,
                             int outOff,
                             int len)
                      throws DataLengthException,
                             java.lang.IllegalArgumentException

  fill len bytes of the output buffer with bytes generated from the derivation function.

  Specified by:
    `generateBytes` in interface `DerivationFunction`
  Throws:
    `java.lang.IllegalArgumentException` - if the size of the request will cause an overflow.
    `DataLengthException` - if the out buffer is too small.

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